PHP 8.1.0 RC 2 available for testing


(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)

hash_initInitialize an incremental hashing context


hash_init ( string $algo , int $flags = 0 , string $key = "" ) : HashContext



Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..). For a list of supported algorithms see hash_algos().


Optional settings for hash generation, currently supports only one option: HASH_HMAC. When specified, the key must be specified.


When HASH_HMAC is specified for flags, a shared secret key to be used with the HMAC hashing method must be supplied in this parameter.

Valorile întoarse

Returns a Hashing Context for use with hash_update(), hash_update_stream(), hash_update_file(), and hash_final().

Istoricul schimbărilor

Versiune Descriere
7.2.0 Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) with HASH_HMAC was disabled.
7.2.0 Return HashContext instead of resource.


Example #1 Incremental hashing example

hash_update($ctx'The quick brown fox ');
hash_update($ctx'jumped over the lazy dog.');

Exemplul de mai sus va afișa:


A se vedea și

  • hash() - Generate a hash value (message digest)
  • hash_algos() - Return a list of registered hashing algorithms
  • hash_file() - Generate a hash value using the contents of a given file
  • hash_hmac() - Generate a keyed hash value using the HMAC method
  • hash_hmac_file() - Generate a keyed hash value using the HMAC method and the contents of a given file

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